običavati

1. formal (+ da / infinitive) to be in the habit of; used to
   Deda je običavao da šeta pored reke svako jutro. — Grandpa used to walk by the river every morning.
   Kao što običavamo reći, bolje ikad nego nikad. — As we are in the habit of saying, better late than never.

Mostly used in the past tense; in speech imati običaj da is more usual.